Question

Question
A scientist fills a glass container with water and places an aquatic plant inside the container, then closes the lid and places the container in direct sunlight. The scientist observes small bubbles on the surfaces of the plant’s leaves on days 1 and 2, but no bubbles on day 3. The scientist concludes that the bubbles were caused by photosynthesis. Which substance should be added to the water in order for the bubbles to reappear?(1 point)
Responses

carbon dioxide
carbon dioxide

oxygen
oxygen

hydrogen gas
hydrogen gas

glucose
glucose

Answer 1

The correct substance to add to the water in order for the bubbles to reappear is **carbon dioxide**.

During photosynthesis, plants utilize carbon dioxide (along with sunlight and water) to produce glucose and oxygen. The small bubbles observed on the plant's leaves are likely oxygen bubbles released as a byproduct of photosynthesis. If the scientist wants to stimulate the photosynthetic process again and observe the bubbling, adding carbon dioxide would be necessary.